Communication system

Abstract

The invention relates to a communication system comprising a control unit ( 100 ), a plurality of circuits ( 101 - 104 ) intended to be accessed by the control unit and a bus ( 105 ) intended to allow a data exchange between the control unit and an accessed circuit. In order to avoid that the circuits have specific address, they are accessed by the control unit in a predefined accessing order, and the system comprises means for changing an address of a circuit so that an accessed circuit has a predefined address. The circuits having no specific addresses, such a communication system is particularly easy to create or modify. The invention is particularly relevant for a dispatching station for TV signals.

1 . A communication system comprising at least: 
 a control unit ( 100 );    a plurality of circuits ( 101 - 104 ) intended to be accessed by the control unit and having addresses;    a bus ( 105 ) intended to allow a data exchange between the control unit and an accessed circuit among the plurality of circuits said communication system being further characterized in that it comprises changing means for changing an address of a circuit and the circuits are accessed by the control unit in a predefined accessing order, an accessed circuit having a predefined address allocated to it by said changing means.    
     
     
         2 . A communication system as claimed in  claim 1 , wherein said changing means comprise at least an accessing wire ( 106 ) connecting a first circuit in the accessing order to the control unit and at least one sequencing wire ( 107 - 109 ) connecting two consecutives circuits in the accessing order.  
     
     
         3 . A communication system as claimed in  claim 3 , wherein said circuits comprise an addressing module ( 201 - 202 ) comprising at least two addressing inputs and at least one data output, a change of a value of the data output of a given addressing module providing changes of the values of at least one of its addressing inputs and at least one of the addressing inputs of the addressing module of the next circuit in the accessing order.  
     
     
         4 . A communication system as claimed in  claim 1 , wherein a circuit further comprises at least a device ( 301 ) controlled by a switch ( 302 ), said switch being closed when said circuit is accessed.  
     
     
         5 . A communication system as claimed in  claim 4 , wherein the addressing module comprises means for generating a switch bit intended to control said switch, said means for generating a switch bit being controlled by the control unit.